George l



G. L. WALKER.

CUTTING BLOWPIPE.

APPucATloN FILED FEB.5.1919.

1,31 0, 1 O3. Patented July 15, 1919.

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UNITED STATES PATENT OFFICE.

GEORGE L. WALKER, 0F NEW YORK, N. Y., ASSIGNOR TO AIR REDUCTION COMPANY, ING., A CORPORATION OF NEW YORK.

CUTTING-BLOWPIPE.

Specification of Letters Patent.

Patented July 15, 1919.

Application led February 5, 1919. Serial No. 275,192.

[o all 'whom it may concern.'

Be it known that I, GEORGE L. WALKER, residin at New York city, in the county of New ork, State of New York, have invented certain new and useful Improvements in Cutting-Blowpipes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to blowpipes employing combustible and oxidizing gases under pressure and more particularly to that class of blowpipes in which the oxygen jet is utilized for cutting metals.

The object of my invention is to provide a cuttin blowpipe having interchangeable tips having discharge passages of varying dimensions and requiring different proportioning of the gases, constructed to provide a gas-tight joint, preventing leakage of the gases, and in which the desired proportioning of the gases is accomplished without resort to ducts of relatively small diameter which are liable to become choked in use, preventing proper functioning of the blow- 1 e. p IFurther objects and advantages of the invention will be apparent as it is better understood by reference to the following specification when read in connection with the accompan ing drawing illustratingthe preferred em odiment thereof in whic Figure 1 is a longitudinal section through a blowpipe head and tip,

Fig. 2 is a section on the line 2--2 of Fig. 1.

Fig. 3 Vis a rear end elevation of the tip and Fig. 4 is a longitudinal section through the tip.

Cutting blowpipes have been heretofore constructed, in which combustible gas is delivered to the heatin jet discharge passage or passages in the t1p through inlet ducts of relatively small diameter, drilled in the rear of the tip. Such inlet ducts are closed except at their ends, so that deposited carbon or shop dust may readily accumulate therein, 'radually reducing the effective area of t e ducts and seriousl impairing the eflicie'ncy of the blowpipe y changing the proportion of the heating mixture. uc accumulation may proceed unnoticed by the workman, until the blovvpipe no longer opcrates, when the ducts are generally cleaned with difficulty and possible damage.

I have devised a cutting blowpipe which, not only provides a secure joint preventing leakage of the gas or contamination of the cutting oxygen, but also provides for proportioning the gases of the heating jets without employing ducts liable to become choked in use. That portion of the tip which proportions the ases in my blowpipe is readily accessible an may be wiped clean without particular effort. No accumulation of carbon or dust is possible, so that my blowpipe has a marked advantage over types of blowpipes now commonly in use.

Referring to the drawing 5 indicates a head having a passage 6 for oxidizing gas intended to supply the cutting jet and passages 7 and 8 for supplying oxidizin and combustible gas for the heating jets. ipes 9, 10 and 11, connected to the head and to source of supply, deliver the gases to the respective passages. The passage 6 terminates at the apex of a conical projecting seat 12 having two channels 13 and 14 concentrically arranged about the end of the passage 6. The passages 7 and 8 terminate respectively in the channels 13 and 14.

A tip 15 provided with an axial cutting jet discharge passage 16. alining with the passage 6, and a plurality of heating jet discharge passages 17, preferably arranged concentrically about the cutting jet discharge passage 16, is assembled with the head 5 by means of a nut 18. At its inner end the ip 15 has a recessed 'surface conforming to the seat 12 and forming inner and outer gas-tight joints between the head and tip, which prevent escape of gases other than through the discharge passages, or mixture of the combustible gas with the oxidizing gas in the passage 6 and the cutting jet discharge passage 16. The recessed surface is countersunk between the `inner and outer joints to provide a path for the gas from the channel 14: which permits it to mix with the gas inthe channel 13. The mixed gases enter the heating jet discharge passage .17 which preferably have their inlets opposite the channel y13. Preferably a channel 18 is formed in the countersunk surface opposite the channel 14 in the head.

The depth of the countersunk surface is carefully regulated to insure a proper proportioning of the gases and varies in tips having heating jet discharge passages of varying sizes requiring different proportioning of the gases. Upon removal of a tip having heating jet discharge passages of given dimensions and substitution of another having the referred dimensions, the desired heating e ect can be obtained and propel' proportioning of the gases is assured. The countersunk surface presents a rela tively open pathway for the gases, affording no lodgment for carbon or other dirt and any accumulation thereof can be readily observed and wiped oi'll by the operator. The conical inner and outer coperating surfaces for m effective joints to prevent escape or improper mixing of the gases.

The cleaning of the countersunk surface, should it become necessary, is so easily effected that no excuse exists for the use of scraping or roaming tools. Thus the danger of enlarging the gas inlet ducts, which is always present in attempting to remove accumulated material in the tips having drilled inlet ducts, is entirely7 obviated. Tips constructed in accordance with my invention should therefore .give practically indefinite service,always with the assurance thatthe original .proportioning of the gases as determined at the factory remains unchanged. These and other advantages' of my invention commend it to the users of such devices.

Various changes may be made in the form, construction and arrangement of the parts, without departing from the spirit and scope of the invention Yor sacrificing any of its material advantages.

I claim:

1. In a device of the character described, the combination of a head having two passages for oxygen, one for combustible gas, and a projecting conical seat, .a tip having a conical recess at. its inner end conforming to said seat and forming therewith inner and outer gais-tif vht joints, abuttingjet dis charge assage isposed in alinement with one of t e oxygen passagesin said head, and a heating jet'dischargepassage communicating with the other oxygen passage in said head, said conical recess being countersunik between the inner and outer joints whereby combustible gas is conve ed to and mix-ed with the oxygen issuing fiom 4the last mentioned oxygen passage.

2. In a device of the character described, the combination of a head having two passages for oxidizing gas, one for combustible Igas and a projecting conical sealing surface, a tip having a comical surface conforming to said sealing surface and forming therewith inner and outer gas-tight joints, a cutting jet discharge assage communicating with one of the oxidizing gms passages, and a heating jet discharge f w f communicat- '@conicw recess; its inner end con ing with the other oxidizing gas passage, said surfaces being spaced between said joints whereby combustible gas is conveyed to and mixed with oxidizing gas before entering said heating jct discharge passage, when said tip is held in assembled relation with said head.

3. In a device ol' the character described, the combination of a head having a sealing surface and a plurality of passages termi- Hating therein, two of said passages conveying oxidizing gas and other combustible gas, a tip having a surface at its inner end conforming to said sealing surface and forming therewith inner and outer gastight joints, a cutting jet discharge passage oommunicating with one of the passages in said head, a heating jet discharge passage, said surfaces being spaced between said joints forming a chamber communicating with said combustible gas passage and with one of the oxidizing gas passages in said head whereby oxidizing and combustible gases are mixed before entering said heating jet discharge passage, when said tip is held in assembled relation with said head.

4. A device of the character described, comprising a head having a projecting seat, two passages for oxidizing gas and apassage for combustible gas terminating .in said seat, and a tip having a surface conforming to said seat and forming therewith inner and outer gas-tight joints, a cutting jet discharge passage communicating with one 0f the oxidizing gas passages in said head, and a heating jet discharge passage, said surface being countersunk between said joints whereby combustible gas is conveyed to and mixed with oxidizing gas issuing from the other oxidizing gas passage in said head before entering said heating jet discharge pasmfge.

5: A device of the character described, comprising a 4head having sa seat, two passages for oxidizing `gies and a passage for combustible gas terminating therein, and a `tip having a .surface conforming to said seat and forming therewith inner and outer gasftight joints, a cutting 'jet dischargepassage communicating with one of the oxidizinggas passagesin said head, and .a heating jet discharge passage, said surface 'being conntersunzk between said joints whereby combustibile gas is conveyed to and mixed oxidizing gas issuing from theot'her oxidizing gas passage in said head, and means' for holding said tip in assembled melationwith said head 6., :1in a dcvicelof the character described, the'cnbinatien of a hea/d having two passages'for oxygen, one for combustble'gas fand fai injecting conical seat, a ti havingaJ ling to seat and crming-therewilthinncr and am am a mm 1a charge passage communicating directly with one of the passages in said head, and a plurality of heating jet discharge passages, the recessed surface of said tip being countersunk between said 'joints whereby combustible gas is conveyed to and mixed with oxygen before entering said heating jet discharge passages.

7. In a device of the character described, the combination of a head having a projecting conical seat a passage for oxygen terminating at the apex of said seat, channels in said seat and passages for oxygen and combustible gas respectively terminating in said channels, a tip having a conical recess conforming to said seat and forming therewith inner and outer gas-tight joints, a cutting jet discharge passage having its inlet at the apex of said conical recess, and heating jet discharge passages, communicating with one of said channels, the recessed surface of said tip being countersunk between said joints, whereby combustible gas from the passage therein said head is conveyed to and mixed With oxygen before entering said discharge passages.

8. In a device of the character described, the combination of a head having a seat and a plurality of passages terminating therein, two of said passages conveying oxygen and the other combustible gas, a` tip having a surface at its inner end conforming to said seat and forming therewith inner and outer gas-tight joints, a cutting jet discharge passage communicating directly with one of the passages in said head and heating jet discharge passages, said head and surface being spaced between said joints, when said tip is assembled with said head, forming a chamber communicating with a combustible and oxidizing gas passage in said head, whereby oxygen and combustible gas are mixed before entering said heating jet discharge passages.

In testimony whereof I aiix my signature.

GEORGE L. WALKER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

